 Okay, Dr. Sanjay Sanyal, Professor, Department Chair. This is going to be the preliminary first dissection of the anterior and the medial compartment of the thigh. So we have completely exposed the right thigh. This is a supine cadaver. I'm narrating from the right side. The camera person is on the left side. So what we see in front of us, straight away we can see this muscle here. This is the sartorius muscle, which takes origin from the anterior sublealia spine, goes obliquely across medially and gets inserted onto the best answer in us on the upper medial part of the tibia. This is also called the tailor's muscle. The sartorius action is, as I mentioned, it's a tailor's muscle, therefore it has got four actions. Flexion of the hip, flexion of the knee, abduction of the hip and lateral rotation of the hip. This was the position which tailors in the earlier days used to use when they used to sit cross-leg on the floor to do their stitching. The next muscle that we can see here is this muscle which I have lifted up. This is the rectus femoris, which is the first component of the quadriceps. When I lift up the rectus femoris, under that we can see another muscle. This is the vastus intermedius. Then we have laterally this muscle. And we can see the fibres are coming from the lateral to the medial side. This is the vastus lateralis. This is the largest of the quadriceps. And then we have this muscle here. We can see the fibres are coming from medial to lateral. This is the vastus medialis. So therefore the quadriceps consists of rectus femoris, vastus intermedius, vastus lateralis and vastus medialis. These four muscles, they combine to form a very strong tendon just above the patella. This is the patella here and this is the quadriceps tendon. And then it forms an aponeurotic expansion over the patella and then it gets inserted by means of the ligamenta patellae which has not been dissected out here to the tibial fibrosis. So this is the full extent of the quadriceps. The most important function of the quadriceps muscle is it's a powerful extensor of the knee. It is three times as powerful as its counterpart antagonist that is the hamstrings which are the flexors of the knee. If there is paralysis of the quadriceps, then there will be severe weakening of the flex tension of the knee. And a person who has got paralysis of the quadriceps, when he tries to walk his knee tends to flex by virtue of the unopposed contraction of the hamstrings. And therefore he tends to walk by holding his thigh just above his knee to support it to prevent it from contracting involuntarily. That is one of the manifestations of paralysis of the quadriceps. To continue with what are the muscles that we can see here, we can see this muscle here. This is the adductor longus. The adductor longus takes origin from the body of the pubic bone and the fibres then come down like this and they get inserted onto the middle one third of the linea aspera which is in the musty aspect of the femur. This adductor longus in riders, those who ride horses for many years, they can develop heterotopic ossification at its origin. That is the tendon of origin of the adductor longus and that is that heterotopic ossification is referred to as riders' bone. Another muscle that we can see here is this one here. This is the gracilis. This gracilis muscle does not have much functional or anatomical use. However, it is used in clinical practice for repairing an incontinent anal sphincter. Now let's mention the femoral triangle. The femoral triangle is a triangle which is bounded naturally by the sartorius and we can see that here. Immediately it is bounded by the adductor longus. The apex of the triangle is where the sartorius crosses the adductor longus. This is the apex of the triangle. And the base of the triangle in this particular category is not visible because he has got a lot of fat which we have to remove. The base of the triangle will be the inguinal ligament which extends from the anterior superior leg spine to the pubic tubercle. We have not completely exposed the femoral triangle yet because it is part of the second section. But at this juncture, I can mention a continuation of the femoral triangle which is referred to as the sub-sartorial or the hunter's canal or the adductor canal. What is this hunter's canal or the adductor canal? It starts from where? The apex of the femoral triangle where the sartorius overlaps the adductor longus. It starts from here. And it ends at the adductor hiatus which is on the back of the knee. It is approximately 15 centimeters long and it is bounded medially by the sartorius muscle. And under the sartorius muscle there is a fascia, part of which we have retained here that is called the sub-sartorial fascia. And there is a plexus called the sub-sartorial plexus. And a little bit of that fascia is visible here. That is the medial boundary. The lateral boundary is the vastus medialis. And the posterior boundary is by the adductor longus and behind that the adductor magnus where it gets attached to the linear aspera. And what are the contents of this adductor canal? The adductor canal basically gives passage to structures from the femoral triangle to the knee. And the contents are from anterior to posterior. We have a longest cutaneous branch of the femoral nerve that is called the syphilis nerve. Then we have the femoral artery and behind that we have the femoral vein. And of course there is a small branch, a branch to the vastus medialis which is also the content of the adductor canal. So this is the adductor location of the adductor canal. We can see this important vein opening into the femoral triangle. This is the long syphilis vein. And if we trace the long syphilis vein we can see that this is the main long syphilis vein which goes one hand with finger width behind the knee and it continues on to the leg. As a matter of fact it starts from the foot and continues up to the leg. Here it pierces through a fascia which is called the crepitiform fascia. And it goes through an opening called the syphilis opening. And then it opens into the femoral vein where the finger is located. The long syphilis vein is a very important vein which is used for any section, any puncture in the leg and it is also used for coronary artery bypass grafting. We have retained a little bit of the fascia here. The whole thigh was covered by this fascia and we can see it's quite a thick fascia. This is called the fascia letter which is the deep fascia of the thigh. This forms a complete encircling cylindrical sleeve around the thigh. And if you want to take a look at the lateral part of this fascia letter we see that it is even more thick and it is almost as thick as a cartilage. This is called the iliotibial tract. This iliotibial tract actually gives attachment to two muscles. One of that we can see partly here. This is the tensor fascia letter muscle. And further posteriorly it gives attachment to a muscle of the gluteal region called the gluteus maximus. And this iliotibial tract then continues further laterally and goes down and gets attached to the tibia on this process here which is referred to as the adrolateral tubercle of Gerdie. This iliotibial tract acts as a functional counterpart of the pest azirinas which is on the medial side which is a composite attachment of three muscles one of which we mentioned was the sartorius. The second component of the pest azirinas is this that is the gracilis. And the third component will be the semitendinosus. So these are the three components of the pest azirinas. So these are the structures that we can see in this particular dissection. More will follow once we dissect out the femurotrangle. Thank you very much for watching. Dr. Sanjay Sanyal signing out. David, how was the camera person? If you have any questions or comments, please put them in the comment section below. Have a nice day.